Fotis N. Koumboulis and  Michael G. Skarpetis and  Maria P. Tzamtzi,  Robust Disturbance Rejection for Left Invertible Singular Systems with Nonlinear Uncertain Structure.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2007, vol. 7(7). 343 - 348
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/6860.